welcome to the Pages Discussions. Draw a line shape, open the "Graphic" inspector and use the menu in the second section to change the line appearance between none, solid an three types of dotted/dasched.
You can do dotted (or at least short-dashed) lines using the Stroke dropdown menu in the Graphics Inspector. Is that not sufficient for what you need? If not, you could create a text box (fixed to page, no wrap) that has a string of periods, and use that as a dotted line, rotating it to whatever angle you need.
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Dotted lines in pages
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